A.3mA | B.30mA | C.0.3A | D.1.1A |
A.30cm | B.28cm | C.26cm | D.24cm |
A.灯L变亮,V示数变大 |
B.L变暗,A示数变小,V示数不变 |
C.L变亮,A示数变大,V示数不变 |
D.L变暗,A示数变小,V示数变小 |
A.适当调高电源电压 |
B.适当调高定值电阻两端的控制电压 |
C.换用阻值大于25Ω的定值电阻 |
D.换用最大阻值更小的滑动变阻器 |
A.R=R1+R | B.R<R2 |
C.R>R2 | D.R=R1 |
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